Shoe midsole with ventilation devices

Abstract

A shoe midsole has a heel portion provided with an elastic shock-absorbing member which is embedded therein and which has an arcuate projection, an air chamber, a plurality of cavities located in the peripheries of the arcuate projection, a plurality of first air ducts through which the cavities communicate with the air chamber, and a plurality of through holes extending from the top surface of the arcuate projection to communicate with the air chamber. The elastic shock-absorbing member further has a plurality of second air ducts extending inwards along the peripheries thereof to communicate with the cavities. The heel portion is provided with a plurality of recesses corresponding in location and number to the second air ducts.

What is claimed is: 
     
       1. A shoe midsole comprising a sole portion, a heel portion, a shank portion connecting said sole portion and said heel portion, and an elastic shock-absorbing member embedded in said heel portion; wherein said elastic shock-absorbing member has an arcuate projection, an air chamber, a plurality of cavities having an open end situated in a top surface of said elastic shock-absorbing member, a plurality of first air ducts through which said cavities are in communication with said air chamber, and a plurality of first through holes extending from a top surface of said arcuate projection to communicate with said air chamber; and wherein said heel portion is provided in a top surface thereof with an opening corresponding in location to said arcuate projection, and with a plurality of second through holes corresponding in location to said cavities. 
     
     
       2. The shoe midsole of claim 1 wherein said arcuate projection is provided in a bottom thereof with a plurality of reinforcing ribs, each of which has a height smaller than a maximum height of said air chamber. 
     
     
       3. The shoe midsole of claim 2 wherein each of said reinforcing ribs has a lower recessed edge of arcuate construction. 
     
     
       4. The shoe midsole of claim 2 wherein said reinforcing ribs are grouped into two sets, with said reinforcing ribs of the same set being parallel to one another, and with said reinforcing ribs of the different set being perpendicular to one another. 
     
     
       5. The shoe midsole of claim 1 wherein said elastic shock-absorbing member is further provided with a plurality of second air ducts which extend along peripheries of said elastic shock-absorbing member to communicate with said cavities; and wherein said heel portion is provided in lateral sides thereof with a plurality of recesses corresponding in location and number to said second air ducts. 
     
     
       6. The shoe midsole of claim 5 further comprising a plurality of stoppers dimensioned to fit into said recesses.